Question

Explain double fertilization.
Class 10 - biology. ​

Answer 1

Answer:

Double fertilization is a complex fertilization mechanism of flowering plants (angiosperms). This process involves the joining of a female gametophyte (megagametophyte, also called the embryo sac) with two male gametes (sperm). It begins when a pollen grain adheres to the stigma of the carpel, the female reproductive structure of a flower. The pollen grain then takes in moisture and begins to germinate, forming a pollen tube that extends down toward the ovary through style. The tip of the pollen tube then enters the ovary and penetrates through the micropyle opening in the ovule. The pollen tube proceeds to release the two sperm in the megagametophyte.

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Answer 2

Answer:

Double fertilisation: It is the process of fusion of one male gamete with the egg nucleus and another male gamete with the polar nuclei or secondary nucleus is called double fertilisation. In all angiosperm plants, there is double fertilisation.

Significance: The triploid nucleus is endosperm nucleus developed to form an endosperm which provides nourishment to the developing improve resulting in the formation of healthy seed and plant.